Korea SIM Card vs eSIM vs Pocket Wi-Fi (2026): Official KT Prices, the Airport-Only Rule and Which One You Need
Staying connected in Korea is easy. The networks are fast almost everywhere, including the subway. The hard part is choosing, because there are four different products with confusingly similar names: a tourist SIM card, a tourist eSIM with a Korean phone number, a data-only eSIM, and a pocket Wi-Fi router. On top of that, your home carrier's roaming may be good enough on its own.
To compare them on real numbers, we used KT (Korea Telecom), one of Korea's three mobile carriers, because its tourist shop publishes the full price list and conditions in English. All prices below were read from KT's official tourist site (roaming.kt.com) and its July 2026 service manual on October 27, 2026. SK Telecom and LG U+ sell similar tourist products through their own counters and resellers, and their prices are broadly in the same range, but check their own pages.
• Just need maps, messages and social media → a data-only eSIM, bought online before you fly.
• Need a Korean 010 phone number (to call restaurants, receive verification texts, or for Korean apps) → a tourist eSIM or SIM with voice, collected and verified at an airport carrier counter.
• Travelling as a group or carrying several devices → a pocket Wi-Fi router (KT: ₩4,400 a day).
• Phone is locked to your home carrier → you cannot use a Korean SIM or eSIM; use roaming or a router.
Step 0: Check your phone can take a Korean SIM or eSIM
Two things decide whether any of this works:
- Country/carrier lock. KT's terms say the lock must be off. If you bought your phone on a contract, ask your carrier before you travel.
- eSIM support. KT's manual gives a simple test: type *#06# on the phone keypad. If an EID number appears, your phone supports eSIM. If it does not, you need a physical SIM card or a router.
Option 1: Tourist eSIM or SIM with a Korean number
This is what KT calls simply "eSIM" (or "Korea SIM" for the physical card). You get unlimited data, a Korean 010 mobile number, free incoming calls and texts, and paid outgoing calls. Here is how KT's own page lays out the difference between this and the data-only version:
The catch is in that last row. KT sells the phone-number version only at its airport roaming centres, and voice and SMS work only after "Identity Verification (Entry Check)" there with your passport. Each passport can verify one number, and each person can buy one voice SIM. The information you enter must match your passport, or the line can be restricted.
At Incheon Terminal 1, KT lists two counters on the arrivals floor: near Arrival Hall A (opposite Exit 2), open 06:00–22:00, and near Arrival Hall F (opposite Exit 13), open 24 hours. There are also counters at Terminal 2, Gimpo and Gimhae airports.
Why would you want a Korean number? Some Korean apps, booking sites and delivery services send a verification code by text to a Korean number, and calling a small restaurant or guesthouse is far easier with a local number. If none of that applies to you, the data-only option is simpler.
Option 2: Data-only eSIM
Same unlimited data, no phone number. Incoming calls and texts are still listed as free after entry check, but you cannot make outgoing calls or send texts, and you cannot add voice later. The big advantage: KT sells it online as well as on site, so you can buy it at home, scan the QR code, and have data the moment you land.
Many third-party eSIM sellers (Airalo, Ubigi and dozens of others) also sell data-only eSIMs for Korea, usually running on one of the Korean networks. Their plans are often sold by data amount (for example 5 GB or 10 GB) rather than by day, and small plans can cost only a few US dollars. For a light user on a short trip, that can be cheaper than a carrier's unlimited daily plan. For someone streaming, uploading videos or tethering a laptop, an unlimited plan is the safer choice.
KT prices (October 2026)
| Days | Data only | Data & Voice | Data & Travel |
|---|---|---|---|
| 1 day | ₩6,500 | – | – |
| 3 days | ₩18,000 | ₩23,500 | ₩16,200 |
| 5 days | ₩27,500 | ₩33,000 | ₩24,700 |
| 7 days | ₩35,000 | ₩40,500 | ₩31,500 |
| 10 days | ₩38,500 | ₩44,000 | ₩34,600 |
| 15 days | ₩55,000 | ₩60,500 | ₩49,500 |
| 30 days | ₩71,500 | ₩77,000 | ₩64,300 |
What "unlimited" means: each line gets 11 GB of full-speed data per day. After that, data continues at 5 Mbps (enough for maps, messaging and standard video), and the 11 GB resets every midnight. Video calls through apps like FaceTime or KakaoTalk work on all plans.
Calls: the Data & Voice plan includes ₩16,500 of call credit, which KT says is about 60 minutes of domestic calls. Extra credit can be added from ₩5,500 (about 20 minutes) up to ₩55,000. Domestic calls cost ₩4.4 per second, texts ₩110 each; international calls ₩23.1 per second. Unused call credit is not refundable.
Option 3: Pocket Wi-Fi router
A small battery-powered hotspot that several phones and laptops can share. KT rents them for ₩4,400 a day or ₩55,000 for 30 days, with unlimited data at up to 20 Mbps.
The conditions are stricter than for an eSIM: you need your passport and a credit card in your own name for the deposit (debit cards are not accepted, and the card must be valid for at least three more months). Cards issued in Korea cannot be used. You collect and return the router at a KT roaming centre, and you have to keep it charged; the listed battery life ranges from 9.5 to 30 hours depending on the model.
For a family of four on a seven-day trip, one router (₩30,800) costs far less than four eSIMs. For a solo traveller, an eSIM is lighter and you never get separated from your connection.
Option 4: Your home carrier's roaming
Many carriers now offer daily or weekly passes for Korea. They are the least effort (nothing to install, you keep your own number for banking codes) but often the most expensive per day, and some throttle data heavily. Check your carrier's Korea rate before you go; if it is under about US$10 a day and you are staying only a few days, it may simply be the easiest choice.
Five rules that cost travellers money
- Do not delete the eSIM. KT's eSIM can be installed only once. If you remove it from your phone, the QR code is not reissued and you cannot extend it; you have to buy a new one.
- Install within 30 days. A KT eSIM not installed within 30 days of purchase is cancelled automatically with no refund. Days are counted in 24-hour blocks from installation, so install it on arrival, not the week before.
- No refunds once bought. KT eSIM purchases cannot be cancelled.
- Bring a foreign card. KT's tourist shop does not accept payment cards issued in Korea, which matters if a Korean friend offers to pay for you.
- 90 days maximum. These are tourist products; the total period with extensions cannot exceed 90 days. Extensions are sold in 5, 10, 20 or 30-day blocks on roaming.kt.com.
Quick answers
Does a Korean eSIM work in the subway? Yes. Korean networks cover subway stations and tunnels.
Can I keep WhatsApp on my home number? Yes. WhatsApp stays linked to your original number even when you use a Korean eSIM for data.
Which is best for Naver Map and Kakao T? Any option with data. Naver Map works fine on data alone; see our Naver Map in English guide.
What if the eSIM does not connect? KT's manual suggests turning Wi-Fi and airplane mode off, mobile data on, and restarting twice. On iPhone, an old carrier profile under Settings > General > VPN & Device Management can block data. KT's foreign-language support line is +82-2-2190-0901 (press 6), weekdays 09:00–18:00.
Prices and conditions checked October 27, 2026 on KT's tourist site roaming.kt.com (eSIM and WiFi Router pages, airport counter list) and the KT Korea SIM/eSIM service manual dated July 2026. Third-party eSIM prices change frequently; compare on the day you buy.
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